(Very) Hard AND nice puzzles
The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.
| Description | solved | Rating | |
|---|---|---|---|
 | Imbalanced Flower by MavericksJD (on 19. June 2022, 21:33) | 31 |  92 % |
| Prison Party of Eight by lepton (on 10. January 2023, 18:59) | 23 | 95 % |
| Even Lighting by Jay Dyer (on 15. February 2023, 23:02) | 68 | 97 % |
| Sandwich X Circles by ICHTUES (on 8. October 2023, 06:00) | 22 | 91 % |
| Death Spiral by Andrewsarchus (on 29. January 2026, 03:03) | 79 | 95 % |
| MIA by zetamath (on 24. May 2022, 16:03) | 100 | 98 % |
| Overflow by IcyFruit (on 10. November 2023, 16:27) | 95 | 95 % |
| Wichtelkalender 2013 - Oktober by pin7guin (on 1. October 2013, 00:00) | 28 | 90 % |
| Araf Killer Sudoku by Phistomefel (on 28. July 2020, 09:00) | 104 | 98 % |
| 2d Wave Particles by zetamath (on 15. July 2021, 18:22) | 32 | 95 % |
| Japanese Nurikabe (1) by KNT (on 4. September 2022, 05:44) | 64 | 97 % |
| Mean World Syndrome [Mean Arrow, Kropki] by Miky (on 1. May 2023, 17:29) | 36 | 96 % |
| Suguru Chaos Deconstruction: Sectioned Thermos by crispy16 (on 23. April 2022, 16:44) | 78 | 98 % |
| Wichtel 2015 (6): MERRY CHRISTMAS! by wichtel (on 18. May 2016, 20:15) | 41 | 99 % |
| Interception (Arrow Sudoku) by tallcat (on 1. September 2021, 14:30) | 43 | 96 % |
| A Wonderful Discovery - Dedicated to Gliperal by damasosos92 (on 21. May 2023, 02:14) | 46 | 97 % |
| Motel (Deconstruction: Numbered Rooms) by purpl (on 8. April 2022, 16:42) | 50 | 98 % |
| Schrödinger's Triplers by Oddlyeven (on 22. July 2023, 17:44) | 52 | 99 % |
| Deconstruction: Region Sums by Jay Dyer (on 24. April 2022, 22:14) | 56 | 99 % |
| Meidjuluk II (N=25) by glum_hippo (on 1. June 2023, 00:00) | 57 | 100 % |
